CCNA Exam Notes: Cisco Certified Network Associate

Overview

The CCIE (Cisco Certified Internetworking Expert) certification denotes proficiency in supporting diverse Internetworks that use routing and bridging technologies. This text provides coverage of the CCNA exam including exactly what the candidate needs to know to pass the exam.


This pocket-sized paperback concisely covers each objective on Cisco's Certified Network Associate (CCNA) Exam 640-407. With brief paragraphs and numbered lists, it itemizes key concepts and ...

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Overview

The CCIE (Cisco Certified Internetworking Expert) certification denotes proficiency in supporting diverse Internetworks that use routing and bridging technologies. This text provides coverage of the CCNA exam including exactly what the candidate needs to know to pass the exam.


This pocket-sized paperback concisely covers each objective on Cisco's Certified Network Associate (CCNA) Exam 640-407. With brief paragraphs and numbered lists, it itemizes key concepts and functions. It also includes test-taking tips and configuration instructions.

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Product Details

  • ISBN-13: 9780782125351
  • Publisher: Wiley, John & Sons, Incorporated
  • Publication date: 3/1/1999
  • Series: CCNA Exam Notes Ser.
  • Edition description: Older Edition
  • Pages: 352
  • Product dimensions: 5.85 (w) x 8.21 (h) x 0.97 (d)

Meet the Author


Todd Lammle is a CCNP, MCT, MCP, CNI, and CNE. The author of the best-selling CCNA: Cisco Certified Network Associate Study Guide and MCSE: TCP/IP for NT Server 4 Study Guide and CIO of Globalnet System Solutions, Inc., Todd has more than fifteen years of experience designing, installing, and troubleshooting LANs and WANs.
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Read an Excerpt


Chapter 2: WAN Protocols

...Identify ISDN protocols, function groups, reference points, and channels

People in the networking industry tend to use a lot of acronyms and other lingo to describe basic things. The parts of ISDN are no exception. In this section, we define some of these terms and the features they describe.

The components we describe are really the nuts and bolts of ISDN, which are very important for you to understand both when you are setting up an ISDN connection and studying for the CCNA exam.


Critical Information

This section focuses on ISDN and how Cisco views its protocols, function groups, reference points, and channels.

ISDN Protocols

ISDN protocols are defined by the ITU-T. Here are three diverse ISDN protocols whose function is specified by their first letter:

  • E protocols apply to ISDN on an existing telephone network.
  • I protocols deal with concepts, terminology, and services.
  • Q protocols pertain to switching and signaling.

Function Groups

Function groups connecting to the ISDN network are known as terminals. These come in two types:

  • TE1 (Terminal Endpoint Device type 1) is a BRI (Basic Rate Interface) that understands ISDN standards. (BRI will be covered in detail in the next section of this chapter.)
  • TE2 (Terminal Endpoint Device type 2) predates ISDN standards. To use a TE2, you have to use a terminal adapter (TA) to generate BRI signals for a Cisco router interface.

ISDN Reference Points

ISDN uses four different reference points to define logical interfaces between functional groupings such as TAs and NT1s. They are as follows:

  • R defines the reference point between non-ISDN equipment and a TA.
  • S defines the reference point between user terminals and an NT2.
  • T defines the reference point between NT1 and NT2 devices.
  • U defines the reference point between NT1 devices and line-termination equipment in a carrier network. (This type of reference point is only used in North America where the NT1 function isn't provided by the carrier network.)

ISDN Channels

There are two types of channels used in BRI ISDN: B and D. Here's what each one does:

  • B, or bearer, channels have a 64Kbps capacity. They can be used for voice or data. Two B channels in a BRI can be combined for a total of 128Kbps.
  • D, or data, channels are used for call signaling or clocking. This type of channel has a 16Kbps capacity.
NOTE     To learn more about ISDN and channels, read the Sybex Advanced Cisco Router Configuration (ACRC) Study Guide.

Exam Essentials

To pass this portion of the exam, you'll need to remember the terminology used for ISDN features, as well as how the various parts function.

Understand the different protocols used in ISDN. The Q protocol specifies switching and signaling. E protocols apply to ISDN on an existing telephone network. I protocols deal with concepts, terminology, and services.

Know the difference between a B channel and a D channel. A BRI uses 2 B channels and one D channel. Each B channel is 64Kbps; a D channel is 16Kbps.


Key Terms and Concepts

BRI: Basic Rate Interface (BRI) is an ISDN interface composed of two B channels and one D channel for circuit-switched communication of voice, video, and data.

ISDN: A digital communication protocol that permits telephone networks to carry data and voice transmissions at higher speeds than typical analog transmission rates.

ITU-T: International Telecommunication Union Telecommunication Standardization Sector. This group creates international standards for internetworks and telecommunications.

OSI: An acronym for Open Systems Interconnection, OSI was created by the International Organization for Standardization (ISO) to create a layered approach to interoperability between disparate systems.

Reference Point: Used to define logical interfaces in ISDN.


Sample Questions

1. What does an R reference point define?

A. The reference point between non-ISDN equipment and a TA
B. The reference point between ISDN equipment and a BRI
C. The reference point between ISDN equipment and a PRI
D. The reference point between non-ISDN equipment and an NA1

Answer: A. R reference points are used when connecting ISDN to a router interface other than a BRI or PRI.

2. When protocols begin with the letter Q, what does that specify?

A. Switching and signaling
B. Existing telephone service
C. Concepts, terminology, and services
D. Quality ISDN service

Answer: A. To read about switching and signaling in ISDN, look for the specifications and protocols that begin with Q.
...
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Table of Contents

Introduction
Ch. 1 OSI Reference 1
Ch. 2 WAN Protocols 37
Ch. 3 IOS 75
Ch. 4 Network Protocols 147
Ch. 5 Routing 221
Ch. 6 Network Security 251
Ch. 7 LAN Switching 267
Index 317
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Sort by: Showing all of 4 Customer Reviews
  • Anonymous

    Posted June 14, 2001

    Great Study Tool

    The Sybex CCNA Study Guide + Exam Notes were a great combination for me. I *read* the Study Guide and *studied* the Exam Notes and was able to pass the CCNA test with a minimal amount of preparation time.

    Was this review helpful? Yes  No   Report this review
  • Anonymous

    Posted September 7, 2000

    Perfect for the Test

    I passed the test on my first try. This book gives you all of the details that you need for the exam. If you know this book you will pass the test.

    Was this review helpful? Yes  No   Report this review
  • Anonymous

    Posted July 4, 2000

    Very Good Book.

    I used this book to pass my CCNA exam in the first shot. Keep in mind this book highlights key points of the exam material, if you do not have a good understanding of WAN Protocols such as ISDN, Frame Relay and ATM, this book, alone, probably is not enough to get by on. If that is the case, I suggest you purchase the Study Guide. Todd Lammle's layout of the information is well organized and easy to follow.

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  • Anonymous

    Posted April 3, 2000

    Excellent Reference

    If you study this book and understand the concepts presented you will pass. Materials are presented in a concise, easy to follow manner. A must for CCNA candidates.

    Was this review helpful? Yes  No   Report this review
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